//设置cookie
function setCookie(name,value)
{
	var Days = 1;
	var exp = new Date();
	exp.setTime(exp.getTime() + Days*24*60*60*1000);
	document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
}
//读取cookie
function getCookie(name)
{
	var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");
	if(arr=document.cookie.match(reg))
	return unescape(arr[2]);
	else
	return null;
}
//删除cookie
function delCookie(name)
{
	var exp = new Date();
	exp.setTime(exp.getTime() - (-1 * 24 * 60 * 60 * 1000));
	var cval=getCookie(name);
	if(cval!=null)
	document.cookie= name + "="+cval+";expires="+exp.toGMTString();
}
//获取url参数
function getQueryString(name) { 
	var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i"); 
	var r = window.location.search.substr(1).match(reg); 
	if (r != null) return unescape(r[2]); return null; 
}